ios - HKStatisticsCollectionQuery 工作一天然后停止。如何让更新处理程序无限期地工作？

Question

此代码的目标是监控用户每天消耗的活跃卡路里。现在代码在第 1 天完美运行。获取当天消耗的用户卡路里，并全天更新卡路里计数。然而，第二天代码停止工作，它只显示用户在第 1 天燃烧的事件卡路里。如何修复此代码，以便更新处理程序继续获取用户每天燃烧的事件卡路里，而不会在结束时停止第一天。

    func getSteps() -> Void {

    guard let energyBurnedType = HKObjectType.quantityType(forIdentifier: .activeEnergyBurned) else {
        fatalError("*** Unable to get the step count type ***")
    }

    var interval = DateComponents()
    interval.hour = 24

    let calendar = Calendar.current

    let anchorDate = calendar.date(bySettingHour: 0, minute: 0, second: 0, of: Date())

    let query = HKStatisticsCollectionQuery.init(quantityType: energyBurnedType,
                                              quantitySamplePredicate: nil,
                                              options: .cumulativeSum,
                                              anchorDate: anchorDate!,
                                              intervalComponents: interval)

    query.initialResultsHandler = {
     query, results, error in

    DispatchQueue.main.async {
        let startDate = calendar.startOfDay(for: Date())
        results?.enumerateStatistics(from: startDate,
                                  to: Date(), with: { (result, false) in
                                    self.moveResult = (Int(result.sumQuantity()?.doubleValue(for: HKUnit.kilocalorie()) ?? 0))})
    }
 }

query.statisticsUpdateHandler = {
    query, statistics, results, error in

    print("update handler set")
    DispatchQueue.main.async {

        // in order to fix problem of steps not updating at the start of new day I tried using Calendar.current
        let currentDay = Calendar.current
        let startDate = currentDay.startOfDay(for: Date())
        results?.enumerateStatistics(from: startDate,
                                     to: Date(), with: { (result, false) in
    self.moveResult = (Int(result.sumQuantity()?.doubleValue(for: HKUnit.kilocalorie()) ?? 0))})
    }
}


 healthStore.execute(query)}}

Answer 1

问题是:

let startDate = currentDay.startOfDay(for: Date())

开始日期不应是今天。

尽量把这个日期定在今天的前几天。

例如:

设置开始日期为今天前 3 天

query.initialResultsHandler = {
 query, results, error in

DispatchQueue.main.async {
    let startDate = Calendar.current.date(byAdding: .day, value: -3, to: Date())
    results?.enumerateStatistics(from: startDate,
                              to: Date(), with: { (result, false) in
                                self.moveResult = (Int(result.sumQuantity()?.doubleValue(for: HKUnit.kilocalorie()) ?? 0))})
}